Sound Alerts: Technology Completed, Phase Research Completed

[michael]

Technology Complete: There should be a sound to alert the player when a tech has completed researching. Preferable behavior is that there is a standard default sound for all techs, but this can be overridden in a tech's json file, allowing for unique sounds for different techs being completed if we wish. Which leads us to...

Phase Research Complete: When a phase is done being researched, there should be some kind of audio feedback. Either a special sound effect or a short (~10 seconds) piece of music.